Air-pump



.J! CARMODY AND L. J-BLOQK AIR Pl lMP. APPLICATION men JULY 16,1919. l,370,516. Patented Mar. 8, 1921.

2 SHEETSSHEET 1.

- vwewtoz J. C. CARMODY AND L. J. BLOCK.

AIR PUMP.

APPLICATION FILED JULY "51919.

1,370,516, Patented Mar. 8, 1921.

2 SHEETS-SHEET 2- J guwnto'c alto Luz?! UNITED PATENT OFFICE.

JOHN C. CARMODY AND LOUIS J. BLOCK, or nnrnorr, MICHIGAN; SAID BLOCK ASSIGNOR TO SAID CARMODY.

AIRJPUMP.

Specification of Letters Patent.

Patented Mar. 8, 1921.

T 0 all whom it may concern:

Be it known that we, JOHN C. CARMQDY and Louis J. BLocK, citizens of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Air-Pumps, of which thefollowing is a specification, reference being bad therein to the accompanying drawings.

This invention relates to air pum s, and the primary object of our invention is to provide a inuiti-cylinder pump wherein the pumping units are disposed in circumferential sets about a common operating shaft and are adapted to insure a continuous and non-pulsating supply of air, under pressure, to an outlet common to all of the Jumping units.

A further object of our invention is to provide an air pumping apparatus wherein the parts are constructed with a view of reducing the cost of manufacture, and at the same time retain those features by which durability, compactness, and ease of assembling are secured. With such ends in view, our invention resides in the novel construction to be herein-a ter specifically described and then claimed.

Reference will now be had to the drawing, wherein- Figure 1 is a front elevation of an air pumping apparatus, partly broken away and partly in section, and

Fig. 2 is a view of one end of the same, partly broken away.

To put our invention into practice, we provide one or more pumping units which are disposed in parallelism on a suitable base and for the purpose of understanding our invention, we have shown two units, generally oesignated i1 and B, said units being identical in construction and in operatable relation to a driven shaft 1 and an air outlet pipe 2. Since the units are idcntical in construction, we deem it only necessary to describe one unit in detail and then briefly refer to the other units.

Each unit comprises vertical parallel circular frames 3 and 4, supported by suitable legs 5 from a foundation 6. Concentric of the circular frames 3 and i are bearings 7 for the shaft 1, and on one end of said shaft is a pulley 8 or other member so that said shaft may be driven from a suitable source of power, while on the shaft at suitable intervals are large gear wheels 9.

Equally spaced about the frames 3 and at are bearings 11 for the trunnions 12 and 13 of pump cylinders 1% which have the inner ends thereof open and the outer ends thereof closed, with the exception of central ports or valve seats 15, communicating with channels 16 which join the trunnions 13, said trunnions being hollow and communicating with the outer ends of the cylinders 14; t.rough the ports or valve seats 15. These ports or valve seats are normally closed by spring pressed check valves 17 mounted in the outer ends of the channels 16 and when there is a pressure of air within the outer ends of the cylinders 14:, the check valves 17 unseat and permit the air to pass through the channels 16 into the hollow trunnions 13.

BBClPI'OCZtblG in the cylinders 14: are pistons 18, each of which has a set of check valves 19, said valves being unseated when the pistons are retracted, to admit air to the cylinders 1 and seated to compress the air when the pistons are distended within the cylinders. The pistons 18 have rigid connecting rods 20 operatively connected to the crank portions 21 of shafts 22, journaled in bearings 23 carried by spokes or radially disposed members 2 l of the frames 3 and 4. The crank shafts 22 are provided with gear wheels 25 meshing with the gear wheel 9 and in consequence of this arrangement the single power shaft 1 may drive the crank shafts 22 at a speed depending on the ratio between the gear wheels 9 and 25.

The outer ends of the tubular trunnions 13 are provided with stufling boxes 26 and said trunnions have a suitable packing 27 within connections 28 of a circular conduit 29, said conduit being connected by branches 30, the rear or front side of the apparatus, to the main air outlet pipe 2. The packing 27 within the conduit connections 28 permits of the tubular or hollow trunnions 13 oscillating in said connections, and said trunnions may cooperate with any other suitable supporting means in maintaining the circular conduits 29 at the side of the frame 4.

The power or driven shaft 1, between the pump units A and B, is provided With a large balance wheel 31 and when the shaft 1 is driven from a motor or other suitable source of power all of the pistons of the units A and B are reciprocated. Assuming that the ratio between the gears wheels 9 and 25 is one to two, and that four pump cylinders are associated with each unit, then each unit produces eight pumping impulses during one revolution of the shaft 1, and as brought out in Fig. 1, it is preferable to dispose the pump cylinders of the unit B V in planes different or intermediate the planes of the pump cylinders of the unit A, so that considering the cooperation of both units there are sixteen impulses to one revolution of the power or driven shaft 1. Since the frames 3 and 4t of each, unit may accommodate a multiplicity of pump cylinders, it is possible to increase the pumping power of the apparatus and thus secure a continuous flow of air, under pressure, from the apparatus. It is therefore apparent that the apparatus may be constructed for any desired capacity, and we attach considerable importance to the fact that the pump units may be compactly assembled and thus pro duce a machine of large capacity that will occupy a comparatively small space.

It is thought that the utility and operation of our pump will be apparent without further description, and while in the drawing there is illustrated a preferred embodiment of our invention, it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claims. 7

What we claim is 1. A multi-cylinder pump embodying parallel units, a power shaft common to said units, an exhaust pipe extending transversely of said units, a balance. wheel on said power shaft between said units, each unit comprising frames, circumferentially disposed cylinders trunnioned in said frames and having valved ports and a channel through a trunnion of each cylinder, a circular conduit at the outer side of each unit establishing communication between all of the cylinder channels of each unit and the said exhaust pipe, pistons reciprocable in said cylinders and valved to admit air thereto, and crank shafts carried by said frame at the inner ends of said cylinders and operated in unison from said power shaft and adaptedjo reciprocate said pistons.

2. A pump as characterized in claim 1, and wherein each cylinder has an enlargement provided with a channel to receive air from the cylinder and each unit has a circular conduit establishing communication between all of the channel enlargements of each unit and the said exhaust pipe.

In testimony whereof we aflix our signatures in presence of two Witnesses.

JOHN C. CARMODY. LOUIS J. BLOCK. lVitnesses:

KARL H. BUTLER, ANNA M. DORR. 

